B Diminished :: B D F

G
D
A
E
♭3
♭5
B
♭5
B
♭3
♭3
B
♭5
B
♭5
♭3
⬤ ⬤
♭3
⬤ ⬤
B♭ Major 6th :: B♭ D F G

G
D
A
E
6
3
B♭
5
B♭
5
6
6
3
B♭
3
B♭
5
5
6
3
⬤ ⬤
6
3
⬤ ⬤